Moldboard for plows.



C. K. MILLER.

MOLDBO ARD FOB FLOWS.

APPLICATION FILED ,MAY 10. 1912.

Patented Nov. 2, 1915.

fir ,w 6M, WK J d m y w n M w COLUMBIA PLANOORAPH 60.. WASHINGTON, D. c.

smite PATENT orFioE;

l CHARLES MILLER, or WAXAHACHIE, Texas, Ass'muo t to THE MOLINE rLow COMPANY, or MOLINE, ILLINOIS, a CORPORATION oritr uors.

MOLDIBQARD role BLOWS To all who mz't may concern:

Be it known that I, GHARLEs MILLER, a citizen of the United States, residing at \Vaxahachie, in the; county of Ellis and State of Texas, have invented certain new and useful Improvements in Moldboards for Plows, of which the following is a specification.

The present invention relates to an improvement. in mold-boards, in which the shedding surface is made from porous material, such as plaster ofvParis or the like, which material experience has shown to be satisfactory for use in certain classes of sticky soil.

The invention has reference more particularly to the provision of a mold-board having a removable element of plaster of Paris,

by which term I shall hereafter, i-n. both the specification and claims, include materials of similar compositions, suitably reinforced or strengthened and made separable from the metal backing or casing to which it is attached, so that it can be made separate at' a factory, shipped to the farmer, and by him attached to or removed from the backing or casing at will.

Experience has shown that certain soils,

such as the gumbo or black waxy soil or Texas, will stick or adhere to a steel or other hard smooth surface to such an extent that a moldboard plow having such a surface will very quickly become clogged and caked with dirt, and so that it will soon cease to cut a furrow or stay in the ground until cleaned, which necessitates frequent stoppages for such purpose. On the other hand, experience has shown that when the discharging surface of the mold-board is madeof plaster of Paris, such soils will not stick tobut will be freely shed from it. The moisture of the soil will enter the pores of the material composing the mold-board and lubricate the surface of the same, so that a mold-board having such a surface will not clog or cake even.

in such soils as the waxy gumbo soil of Texas. It has been found, however, that such porous material wears rapidly when subjected to continuous use, Therefore, the useful life of a porous surface element. is very short, and the life of the entire ncid- 7 board is limited to that of the porous mate- Specification of Letters Patent.

rial when such material constitutes an-inteentire structure ll t be made at frequentintervals, withres ulting inconvenience to thejfariner and greatly increased expense. i

The main object of my present invention is to meet the aforementioned objections to moldboard plows having porous shedding surfaces. Ido this providing a construc fat n e ev. 2 .5.- Application filed May 10, 19 12 Seri a11 T;o.696,4=4 1.

.glgtl-por ion' Of mold-board; Such life i i be ng comparatively. short,wrenewal oflthe tionin which the porous surface element is T separatefrom the backing or casing which supports it, and wh ch surface element 1s so made and-re nforced as to have sufficient mechanical strength to withstand the-rough..

treatmentjwhich itfwill receive in storage, shipment to the farmer,- and attachment to the metal backing or casing on the plow.

Inothen words, the main object of my present invention isto provide a reinforced surface element, or plaster of Paris, so made and strengthened orreinforced that it can be manufactured at a suitable plant, safely shipped to the'fariner, and by him adjusted or attached to themetal backing or casing of his plow. Thus, to provide amold-bo,ard

plow having all "or thedesirable character-is tics of one which has a porous shedding surface and is consequently adapted for use in sticky soils, without the attendant disadvantages, excessive cost,- etc., which have heretofore accompanied such a device,

Other objects 'and uses will appear from a. detailed description of the invention,

which consists in the features of construction and combination of parts hereinafter I described and claimed. 1 i i t a he drawings,- Figure 1 shows'a face view of a mold-board provided with the removable surface element to which this in partly atjthe surface of reinforcement; and

- Fig. 3 shows a cross section taken on line 3,3 of Fig,=2, looking in the direction of the arrows.

*In the drawing, the metal backingor casing which is adapted-to receive the-porous surface element is designated by the nuineral 4.: It is in the form of a pan, prefvention relates Fig. 2 shows a section take n I material itself.

removable porous element which is adapted to lie uniformly in said pan and conform to its contour. As a general proposition, the porous element, as already said, is made from plaster of Paris or other like material. Therefore, it is comparatively brittle and will not withstand rough handling or treat-- ment without fracturing'or breaking. Consequently, an element formed of such material without reinforcing could not safely be subjected to the rough usage and handling which it would ordinarily receive in manufacture and shipment from a factory to the farmer'or local dealer. To meet this difliculty, I provide a reinforcement which is embedded in the material of the porous element itself and really becomes a portion of such element. In the particular construction illustrated, this takes the form of a wire screen 8 or the like, the meshes of which are filled with, and the wires of which are surrounded and covered by, the porous The gage of the wire of such reinforcement, and the size of the openings therein, will be adjusted to the particular requirements of the element which is being molded, such as its size, thickness, etc. It is simply desired to reinforce the porous element to that extent necessary to give it the requisite strength, exemption from breakage, and make its shipment and handling safe until it is connected to the metallic pan or backing. Thus the farmer can 'buythe porous elements, have them shipped to the point of delivery, and then set them in or attach them to the backing or casing of his plows as needed.

As a general proposition, the surface pressure of the earth will hold the porous element back in the'casing when once seated, so as to keep it properly seated in the same. However, in order to prevent the porous element from falling out of the pan when the mold-board is not being used inplowing, and the surface pressure thus removed, I have provided means for attaching the porous element to the pan. In the particular construction illustrated, such means comprise a threaded socket 9 or the like, which is cast into the porous element and really comprises a portion of the same. A tap nut 10 may then be passed through the pan from the back thereof and screwed into such socket to secure the necessary connection between the parts.

The hardness of the material used in molding the porous elements may be determined by the characters of the soils in which they are to be used. I have found by experience that a composition composed of a mixture ofplaster of Paris and cement is in general best adapted for this service, and that by varying the percentages of these materials the hardness of the resulting porous element can be adjusted to that extent necessary to adapt the mold-board for use in different classes of soil. As a general proposition, the variation of this percentage will be between the limits of five per cent. (5%) cement and ninety-five per cent. (95%) plaster of Paris, andetwenty-five per cent. (25%) ccment and seventy-five per cent. (75%) plaster of Paris. However, I do not limit myself to any particular composition of material, except as may be hereafter called for in the claims, but I include within the scope of my invention any composition, or any material of a porous nature, reinforced in a suitable manner, so that it may constitute a separate and separable element from the hacking into which it is to be inserted, and which may be safely shipped and handled prior to insertion into and connection with said backing, and which may be applied to and removed from .its metal backing or seat without the necessity of skilled assistance.

I claim:

1. In a two-part mold board, the combination with a back section in the form of a pan of desired contour and configuration according to the desired shape of the mold board, said pan being provided with a pcripheral flange having its inner face beveled outwardly, of a removable section seated into said pan and of the same contour and configuration as the pan and having its periphery beveled to seat against the flange of the pan, said removable section being formed of moisture absorbing and soil shedding material, and being of a thickness substantially equal to the height of the peripheral flange on the pan, a reinforcing netting completely embedded in the material of the removable section, and means for temporarily securing the removable section in place within the pan, whereby the removable section may be directly seated into the pan, by moving the same directly toward the pan.

2. In a two-part mold board, the combina tion with a back section in the form of a pan of desired contour and configuration ac cording to the desired shape of the mold board, said pan being provided in its periphcry with forwardly projecting supporting means having their inner surfaces beveled outwardly, of a removable section seated into said pan and of the same contour and configuration as the pan and having its periphery beveled to seat against the flange of the supporting means, said removable section being formed of moisture absorbing and soil in the pan, whereby the removable section.

shedding material, and being of a thickness may be directly seated into the pan, by movsubstantially equal to the height of the suping the same directly toward the pan.

porting means a reinforcing netting com- CHARLES K. MILLER. pletely embedded in the material of the re- WVitnesses: I

movable section and means for temporarily c THOS. J. MARSHALL;

securing the removable section in place'with- JAMES J. LAMB.

I Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington D. C. 

